Body language, psychology and linguistic experts have tonight revealed how Mitchell Quy's behaviour during a media campaign gave away tell-tale signs he was lying.

The former casino croupier strangled his wife Lynsey Wilson to death in 1998, before mutilating the body of the mother of their children and hiding parts around Southport.

He was so confident he could get away with her brutal execution he allowed documentary makers to capture his life as he played the doting husband, desperately seeking any news about the 'missing' mother of his two children.

And the notorious Southport murderer's footage was the subject of in-depth analysis on 'Faking It: Tears of a Crime' ' this evening.

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Documentary maker Chris Malone says Quy created a lie so great he believed his own story in the end. He said: "He had no problem giving me access [to film a documentary]

"It was absolutely fascinating spending time with someone who, I suspected, had murdered his wife. Pretending to be someone whose wife had left him."

"I was staggered at some of the things he said."

During filming, Quy repeatedly refused to answer questions about Lynsey and whether he played a part in her disappearance..

Linguistics specialist Professor Dawn Archer, of Manchester Metropolitan University, says this is a strategy; 'attacking the legitimacy' of the questions asked of him.

She said: "Several times in the documentary he talks about having already answered [that] question. So, it's a defensive mechanism, it's an evasive strategy. If you don't want to answer the question directly you ridicule the question or the questioner."

Body language specialist Cliff Lansley, known on the show as The Watcher, added: "As soon as he is asked if he killed Lynsey, the corner of his mouth raises slightly towards his ear. This unilateral movement is not a smile, it's a movement representing contempt. A position of moral superiority.

"He then fully smiles, showing the kick he is getting from his inception. It's as if he's saying 'I don't need to answer that question, it's up to you to prove I'm guilty, which is something that you can't do because I'm so much smarter than you'."

Forensic psychologist Kerry Daynes says it's interesting Quy worked at the fairground and a casino, because he was a classic game-player.